President Barack Obama gestures during a speech on climate change, Tuesday, June 25, 2013, at Georgetown University in Washington. Obama is proposing sweeping steps to limit heat-trapping pollution from coal-fired power plants and to boost renewable energy production on federal property. (AP Photo/Evan Vucci)

President Barack Obama gestures during a speech on climate change, Tuesday, June 25, 2013, at Georgetown University in Washington. Obama is proposing sweeping steps to limit heat-trapping pollution from coal-fired power plants and to boost renewable energy production on federal property. (AP Photo/Evan Vucci)